Name of index

FCC-V

E281

APPEARANCE

White crystalline or crystalline powder

White crystalline hygroscopic powder, or a fine white powder

Content

99.0-100.5(drying basis)%

≥99.0% (105°C,2h)

pH (10 % aqueous solution)

--

7.5-10.5

As ≤%

--

0.0003

Heavy metals ≤%

--

0.001

Alkalinity (as Na₂CO₃)

Passes test (about 0.15%)

--

Loss on drying ≤%

1

4 (105°C,2h)

Water insoluble ≤%

--

0.1

Iron ≤%

0.003

0.005

Lead ≤%

0.0002

0.0005

Mercury ≤%

--

0.0001